Fix/multiple import - meta edition (nf-core#10134)

* move readgroup functions to subwf

* fix meta

Author: matthdsm

subworkflows/nf-core/bcl_demultiplex/meta.yml

@@ -10,7 +10,6 @@ keywords:
 components:
   - bcl2fastq
   - bclconvert
-  - generatereadgroup
 input:
   - meta:
       type: map